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Finding the Fourth Proportional to 76.66, 114.84 and 61.26

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Solution

The fourth proportional to 76.66, 114.84 and 61.26 is: 91.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.66 : 114.84 = 61.26 : x
  2. Step 2: Convert to fraction form
    76.66/114.84 = 61.26/x
  3. Step 3: Cross multiply
    76.66x = 114.84 × 61.26
  4. Step 4: Simplify right side
    76.66x = 7,035.37
  5. Step 5: Solve for x
    x = 7,035.37/76.66
  6. Step 6: Final answer
    x = 91.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.